Angles in a triangle
Go to https://whiterosemaths.com/homelearning/year-6/ and watch lesson 2 - angles in a triangle.
Have a go at the questions https://wrm-13b48.kxcdn.com/wp-content/uploads/2020/homelearning/year-6/Lesson-2-Y6-Summer-Block-1-WO5-Angles-in-a-triangle-2020.pdf